The US has charged six Chinese nationals over the alleged theft of technology used in mobile phones.
The six, including three university professors, are accused of using the technology to benefit universities and companies controlled by Beijing.
One of the group, Tianjin University professor Hao Zhang, has been arrested but the rest are believed to be in China.
Alleged Chinese economic espionage has long been a concern in Washington.
According to a US Justice Department indictment, the scheme began more than a decade ago.
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